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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Persson, Ingmar
Swedish University of Agricultural Sciences
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (18/18 displayed)
- 2020Solution chemistry in the surface region of aqueous solutionscitations
- 2019Chemical equilibria of aqueous ammonium-carboxylate systems in aqueous bulk, close to and at the water-air interfacecitations
- 2016Self-assembled SnO2 micro- and nanosphere-based gas sensor thick films from an alkoxide-derived high purity aqueous colloid precursorcitations
- 2015The structures of CyMe4-BTBP complexes of americium(III) and europium(III) in solvents used in solvent extraction, explaining their separation propertiescitations
- 2015The structures of CyMe4-BTBP complexes of americium(III) and europium(III) in solvents used in solvent extraction, explaining their separation propertiescitations
- 2014Speciation and structure of lead(II) in hyper-alkaline aqueous solutioncitations
- 2012Crystal Structures of [Hg10(dmso)16](ClO4)10 and [Hg2(H2O)2](ClO4)2citations
- 2010Structural Study of the N,N’-Dimethylpropyleneurea Solvated Lanthanoid(III) Ions in Solution and Solid State with an Analysis of the Ionic Radii of Lanthanoid(III) Ionscitations
- 2008Fenton-Induced Degradation of Polyethylene Glycol and Oak Cellulose. A Model Experiment in Comparison to Changes Observed in Conserved Waterlogged Woodcitations
- 2008Structure of solvated mercury(II) halides in liquid ammonia, triethyl phosphite and tri-n-butylphosphine solutioncitations
- 2007X-Ray Absorption Fine Structure Spectroscopic Studies of Octakis-(dimethylsulfoxide)lanthanoid(III) Complexes in Solution and in the Solid Iodidescitations
- 2006Crystal Structure of Lead(II) Acetylacetonate and the Structure of the Acetylacetone Solvated Lead(II) Ion in Solution Studied by Large Angle X-ray scatteringcitations
- 2004Structure of the Hydrated, Hydrolysed and Solvated Zirconium(IV) and Hafnium(IV) Ions in Water and Aprotic Oxygen Donor Solvents. A Crystallographic, EXAFS Spectroscopic and Large Angle X-ray Scattering Studycitations
- 2003Dimethyl Sulfoxide Solvates of the Aluminium(III), Gallium(III) and Indium(III) Ionscitations
- 2003A Structural Study of the Hydrated and the Dimethylsulfoxide, N,N’-Dimethyl-propyleneurea, Acetonitrile, Pyridine and N,N-Dimethylthioformamide Solvated Nickel(II) Ion Solution and Solid State
- 2003The discovery of the N,N-dimethylthioformamidium ion. A structural study of {(CH3)2NCHSH)}2[HfCl6] in solid state and solutioncitations
- 2001New Class of Oligonuclear Platinum-Thallium Compounds with a Direct Metal-Metal Bond. 5. Structure of Heterodimetallic Cyano Complexes in Aqueous Solution by EXAFS and Vibrational Spectroscopycitations
- 2001Crystal and Solution Structures of N,N-Dimethylthioformamide-Solvated Copper(I), Silver(I), and Gold(I) Ions Studied by X-ray Diffraction, X-ray Absorption, and Vibrational Spectroscopycitations
Places of action
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article
Self-assembled SnO2 micro- and nanosphere-based gas sensor thick films from an alkoxide-derived high purity aqueous colloid precursor
Abstract
Tin oxide is considered to be one of the most promising semiconductor oxide materials for use as a gas sensor. However, a simple route for the controllable build-up of nanostructured, sufficiently pure and hierarchical SnO2 structures for gas sensor applications is still a challenge. In the current work, an aqueous SnO2 nanoparticulate precursor sol, which is free of organic contaminants and sorbed ions and is fully stable over time, was prepared in a highly reproducible manner from an alkoxide Sn(OR)4 just by mixing it with a large excess of pure neutral water. The precursor is formed as a separate liquid phase. The structure and purity of the precursor is revealed using XRD, SAXS, EXAFS, HRTEM imaging, FTIR, and XRF analysis. An unconventional approach for the estimation of the particle size based on the quantification of the Sn–Sn contacts in the structure was developed using EXAFS spectroscopy and verified using HRTEM. To construct sensors with a hierarchical 3D structure, we employed an unusual emulsification technique not involving any additives or surfactants, using simply the extraction of the liquid phase, water, with the help of dry butanol under ambient conditions. The originally generated crystalline but yet highly reactive nanoparticles form relatively uniform spheres through self-assembly and solidify instantly. The spheres floating in butanol were left to deposit on the surface of quartz plates bearing sputtered gold electrodes, producing ready-for-use gas sensors in the form of ca. 50 μm thick sphere-based-films. The films were dried for 24 h and calcined at 300 °C in air before use. The gas sensitivity of the structures was tested in the temperature range of 150–400 °C. The materials showed a very quickly emerging and reversible (20–30 times) increase in electrical conductivity as a response to exposure to air containing 100 ppm of H2 or CO and short (10 s) recovery times when the gas flow was stopped.